Image caoture by my dear friend Luiz Duzmzal. He kindly allow me to process this high quality image, what gave me too nuch pleasure,

Capture:

Imaging telescope or lens: Takahashi FSQ-106ED

Imaging camera: QHY CCD QHY16200A

Mount: Astro-Physics AP MACH1 GTO

Guiding camera: QHY5L-II mono

Filter: Baader LRGB 2" Filters

Accessories: Stardome, Precise Parts custom adaptors, sharpsky.net SharpSky Pro digital focuser

Resolution: 4514x3602

Dates: June 24, 2017

Frames: 37x300"

Integration: 3.1 hours

RA center: 253.724 degrees

DEC center: -42.756 degrees

Pixel scale: 2.327 arcsec/pixel

Orientation: 178.409 degrees

Field radius: 1.866 degrees

Desc:

The area around the blue-yellow pair of stars Zeta 1 and Zeta 2 in Scorpius includes the extensive RCW 113 (Gum 55) emission nebula, and two dark nebulae: Sandqvist 17 (SL 17, or Wolf nebula) at bottom, and Sandqvist 19 (SL 19) at upper left. The RCW 113 nebula, located 5000 light years far from us, shines due to ionisation by ultraviolet light emitted by OB stars belonging to the open cluster NGC 6231 (at top) and its surroundings.

"NGC 6231 is a young cluster in the southern sky, around 3-5 Myr old,

located at a distance of about 1.6 kpc at the near side of the Sagittarius spiral arm.

It forms the nucleus of the extended Sco OB1 association. The cluster is very rich,

with more than 100 massive stars, among them 15 O-stars. Radial velocity studies

have revealed a very large binary fraction among these OB stars. The young low mass

population has recently been identified using deep X-ray observations. Within the

large HII region Gum 55 that surrounds NGC 6231 there exists a major elephant trunk,

which shows evidence for recent second-generation star formation in the form of young

B-stars surrounded by reflection nebulae and a number of low-mass Hα emission stars."

(Handbook of Star Forming Regions Vol. II, Astronomical Society of the Pacific, 2008

Bo Reipurth, ed., see galaxymap.org)